Valve-gear.



Patented Mar. [8, |902.

H. DAMERELL.

VALVE GEAR.

(Application med Aug. 27, 1901.

(No Modal.)

y UNITED STATES PATENT OEEICE.l

HENRY DAMERELL, OF RACINE, WISCONSIN, ASSIGNOR OF AONE-IIALFTO FRANKWAY, OF OHILLIOOTI-IE, MISSOURI.

VALVE-GEAR.

SPECIFICATION'forming part of Letters Patent No. 695,445, dated March18, 1902. Application filed August 27, 1901. Serial No. 73,455. (Nomodel.)

vTo @ZZ whom t may concern:

Be it known that I, HENRY DAMERELL,a citizen of the United States,residing at Racine, in the county of Racine and State of Wisconsin, haveinvented a new and useful Improvement in Valve-Gear, of which thefollowing is a specification. 1.L

My invention relates to certaihdmprovements in valve-gear forsteam-engines, and has for its object to effectively regulate a supplyof steam to a reversible engine by varying the point of cut off, thegovernor being so larranged and connected to the valve-operatingmechanism as to `tend to move such mechanism from either extreme ofposition to a central position.v y

A further object of the invention is to effect the governing of theengine without reducing the volume or pressure of steam in thesteam-chest and without wire-drawing, thev throttle being at all timeswide open.` V A A still further object of my inventionis to regulate thesensitiveness of the governor, so as to prevent hunting.

With these and other objects in view the invention consists in theimproved governing device,- hereinafter more fully described, andparticularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a side elevation,- partly insection, of a governor constructed and arranged in accordance with myinvention; and Fig. 2 is an end elevation of a portion of the same.

In the drawings similar numerals of reference indicate correspondingparts in both of the figures.

1 designates a bell-crank lever connected to any suitable form ofreversing mechanismsuch, for instance, as the ordinary and wellknownlink, the movement of which will effect arreversal ofthe steam-valve.The upper end of this lever has two extremes of movement, as indicatedin full lines at-2 and by dotted lines at 3, and the movement fromeither position toward a central or mid position causing an earlier cutoff of the steam and reducing the quantity of steam supplied to thecylinder. The position 2 indicates the full-open position with theengine running forward and the block :at one end or corner of the link,and the dotted-line position 3 represents the opposite extreme ofmovement with the engine reversed or running backward. To operate thisreversing mechanism, I employ the usual reversing-lever 4., vhaving alatch 5, which may be locked in any one of three positions ou the usualnotched bar, the lever being connected by a series of suitableintervening rods to the bell-crank lever 1. v

7 indicates a suitable frame, in which `is journaled a horizontal shaft8, driven by any suitable intervening mechanism, usually a lbelt andpulley-wheels, from the main shaft of the engine. On this shaft 8issecured a beveled gear 9', the teeth of which intermesh with thesimilar teeth of a beveled .gear 10, secured to thelower end of a sleeve11, journaled inthe frame and connected by bolts or set-screws 12 toarevoluble frame 13,'having radially-projected arms 14. In the upper andouter ends of the armsle are pivoted bellcrank. levers'l, the verticalarms of which are provided with the usual weights 16, the latter beingconnected to each other bya controlling device in the form of vahelicallycoiled tension-spring.17,which normallyvholds 19 and 20 andsuitable ball-bearings 21 22 be- Y ing placed between the three collarsto reduc the friction to a minimum.

The upper and lower collars 1-9 and 2O are keyed or secured by suitablepins 23 to a vertical rod 24, the movements of which .are transmitted tothe bell-crank lever l and effectv the movement of thelatter in adirection tending toward the mid-position from either extreme ofmovement.

Journaled in suitable bearings 24C' in the frame 7 is a horizontal shaft25, secured at one end to an arm 26, the outer or lower end of which ispivotally connected to the lower end of the vertical rod 2l. Coiledaround the shaft is a torsion-spring 27, one end of which is secured tothe shaft and the opposite end to a ratchet-wheel 2S, journaled looselyon the shaft and adapted to be operated by a wrench which may be placedon an angular extension 29 of the ratchet, any backward movement of theratchet-wheel being prevented by a locking-pawl 3l, pivoted to the frameand engaging with the teeth of the ratchet-wheel, as shown by dottedlines in Fig. l. The turning of the ratchetwheel will cause a winding upor tightening of the spring, increasing its torsional strain and tendingto depress the arm 26 and the vertical rod 24 and to some extent resistthe operation of the governor. This adjustment is delicate, but iseffective in preventing hunting and will enable the governor to morereadily restablish its equilibrium after any sudden movement of thevalve.

Pivoted to the frame of the machine ou a stud 3l is a bell-crank lever32, the shorter arm of which is connected by a link 33 of any suitablelength to the reversing-lever 4C and the longer arm of the lever beingconnected by a link 34; to a second link 35, the opposite end of whichis pivoted on a stud 3G, near the juncture of the arm 26 and thevertical rod 2a. From the pivot-point of the links 34k and 35 thereextends a rod 37, connected to the upperend of the bell-crank lever 1.

The operation of the device is as follows: Assuming the parts to be inthe position illustrated in full lines in the drawings, any upwardmovement of the vertical rod 24 under the influence of the governor willcause a corresponding upward movement of the arm 2G and link 35, thelatter being drawn slightly in the direction of the vertical rod 24 andtending to move the bell-crank lever l,through the rod 37, in thedirection indicated by the arrowthat is to say, from the full-openposition 2 to the central or closed position at a point midway betweenthe two limits of movement. This movement will be transmitted to thelink and through the latter to the valve, causing the valve to cut offat an earlier point in the stroke, reducing the volume of steam suppliedto the cylinderand in a measure reducing the speed of the engine. Whenthe lever 4f is moved to the dotted-line position, it will effect acorresponding movement of all the various parts, including the bellcranklever l, to the position shown by dotted lines, the lilik being then inthe opposite position, the valve full open, andthe engine reversed orrunning backward. Any upward movement of the vertical rod 24 under theinfluence of the governor will then tend to raise arm 2G and, throughthe link 35, force the rod 37 away from the vertical rod and cause thcbell-crank lever l to travel from thc position 3 toward the position 2,the eiiect on the link and valve being the same, but in the reversedirection, as previously described.

On the shaft 25 is secured a lever 30, which may be used as a hand-leverto operate the governor in adjusting or to be tied downto prevent theaction of the governor when high speed is desired.

The device may be modified in a variety of ways as may be necessary inadapting it for use in connection with any suitable reversing-gears, andit will be understood thatI do not wish to limit myself to theapplication of the device to the link reversing-gear or to any otherparticular type, the arrangement being adapted for use in connectionwith any reversing-gear having two full-open positions.

Having thus described my invention, what I claim is- 1. In a device ofthe class speciied, a governor, a longitudinally-movable rod operativelyconnected thereto, an arm pivotally connected at one end to the rod andat the opposite end to a fixed fulcrum, a reversing mechanism, a rod andlink pivoted together and connected respectively to the reversing'mechanism and the said pivoted arm, a reand a series of jointed leversconnected toI the reversing-lever, the reversing mechanism and the arm26, substantially as specified.

3. The combination with a reversing mechanism, of a governor, afnlcrumed arm adapted to be operated by said governor, connectionsbetween said arm and said reversing mechanism and means for adjustingsaid connections to opposite sides of the fulcrum of said arm, wherebythe movement in one direction of said arm may be transmitted in thereverse direction to said reversing mechanism, substantially asspecified.

At. The combination with a reversing mechanism, of an operating-lever, agovernor, a fulcrumed arm 26 operatively connected to said governor,abell-crank lever 32 fnlcrumcd to a fixed point and having one of itsarms connected to the operating-lever, and a scries of links connectingthe opposite end of said bell-crank lever to the ar 26 and to thereversing mechanism, substantially as specified.

5. The combination with a reversing mechanism, of a reversing-lever, agoverning device, a vertically-operated rod 24 connected to thegovernor, a lever 26 fulcrumed to a iixed point and connected at one endto the rod 24v, a bell-crank lever 32, a link con- 'neoting one arm tothe bell-crank lever to the myown I have hereto afxedmy signature inreversing-lever, links 34 and 35 connecting the presence of twoWitnesses. the opposite end of the bell-drank leverl to the arm 26, anda, rod 37 extending from the june- 5 ture of the links 34 and 35 to thereversing Witnesses: mechanism, substantially as specified. MARTIN.LI-IENDERSON, In testimony that I olziim the foregoing as JAMES GRAHAMKIDDLE, J1'.

HENRY DAMERE'LL,

